Pacemaker is an advanced, scalable high-availability cluster resource manager.
It supports "N-node" clusters with significant capabilities for managing resources and dependencies.
It will run scripts at initialization, when machines go up or down, when related resources fail and can be configured to periodically check resource health.
Pacemaker is distributed by ClusterLabs.
Many, many developers have contributed significantly to the project since. The git log is the definitive record of their greatly appreciated contributions.
The wider community of Pacemaker users is another essential aspect of the project's existence, especially the many users who participate in the mailing lists, blog about HA clustering, and otherwise actively make the project more useful.
There are multiple user interfaces for Pacemaker, including command-line tools, graphical user interfaces and web frontends. The crm shell used to be included in the Pacemaker source tree, but is now a separate project.
This is not an exhaustive list:
clufter is a general-purpose tool for converting one cluster representation format to another. Among other possibilities, it can convert from a cluster based on rgmanager with CMAN to a one based on pacemaker with corosync. See its documentation for details.
：Code submit frequency
：React/respond to issue & PR etc.
：Well-balanced team members and collaboration
：Recent popularity of project
：Star counts, download counts etc.